WARNING: This product is for research use only, not for human or veterinary use.

MedKoo CAT#: 529512

CAS#: 627085-11-4 (free base)

Description: OT-551 is a NF-κB inhibitor potentially for the treatment of cataracts and age-related macular degeneration.

Chemical Structure

CAS# 627085-11-4 (free base)

Theoretical Analysis

MedKoo Cat#: 529512
Name: OT-551
CAS#: 627085-11-4 (free base)
Chemical Formula: C13H23NO3
Exact Mass: 0.00
Molecular Weight: 241.330
Elemental Analysis: C, 64.70; H, 9.61; N, 5.80; O, 19.89

Price and Availability

This product is not in stock, which may be available by custom synthesis. For cost-effective reason, minimum order is 1g (price is usually high, lead time is 2~3 months, depending on the technical challenge). Quote less than 1g will not be provided. To request quote, please email to sales @medkoo.com or click below button.
Note: Price will be listed if it is available in the future.

Request quote for custom synthesis

Related CAS #: 627085-15-8 (HCl)   627085-11-4 (free base)    

Synonym: OT-551; CPC-551; OT 551; CPC 551; OT551; CPC551

IUPAC/Chemical Name: 1-hydroxy-2,2,6,6-tetramethylpiperidin-4-yl cyclopropanecarboxylate


InChi Code: InChI=1S/C13H23NO3/c1-12(2)7-10(8-13(3,4)14(12)16)17-11(15)9-5-6-9/h9-10,16H,5-8H2,1-4H3


Appearance: Solid powder

Purity: >98% (or refer to the Certificate of Analysis)

Shipping Condition: Shipped under ambient temperature as non-hazardous chemical. This product is stable enough for a few weeks during ordinary shipping and time spent in Customs.

Storage Condition: Dry, dark and at 0 - 4 C for short term (days to weeks) or -20 C for long term (months to years).

Solubility: Soluble in DMSO

Shelf Life: >2 years if stored properly

Drug Formulation: This drug may be formulated in DMSO

Stock Solution Storage: 0 - 4 C for short term (days to weeks), or -20 C for long term (months).

HS Tariff Code: 2934.99.9001

More Info:

Biological target:
In vitro activity:
In vivo activity:

Preparing Stock Solutions

The following data is based on the product molecular weight 241.33 Batch specific molecular weights may vary from batch to batch due to the degree of hydration, which will affect the solvent volumes required to prepare stock solutions.

Recalculate based on batch purity %
Concentration / Solvent Volume / Mass 1 mg 5 mg 10 mg
1 mM 1.15 mL 5.76 mL 11.51 mL
5 mM 0.23 mL 1.15 mL 2.3 mL
10 mM 0.12 mL 0.58 mL 1.15 mL
50 mM 0.02 mL 0.12 mL 0.23 mL
Formulation protocol:
In vitro protocol:
In vivo protocol:

Molarity Calculator

Calculate the mass, volume, or concentration required for a solution.

*When preparing stock solutions always use the batch-specific molecular weight of the product found on the vial label and SDS / CoA (available online).

Reconstitution Calculator

The reconstitution calculator allows you to quickly calculate the volume of a reagent to reconstitute your vial. Simply enter the mass of reagent and the target concentration and the calculator will determine the rest.


Dilution Calculator

Calculate the dilution required to prepare a stock solution.

1: Wong WT, Kam W, Cunningham D, Harrington M, Hammel K, Meyerle CB, Cukras C, Chew EY, Sadda SR, Ferris FL. Treatment of geographic atrophy by the topical administration of OT-551: results of a phase II clinical trial. Invest Ophthalmol Vis Sci. 2010 Dec;51(12):6131-9. doi: 10.1167/iovs.10-5637. PubMed PMID: 20574018; PubMed Central PMCID: PMC3055748.

2: Tanito M, Li F, Anderson RE. Protection of retinal pigment epithelium by OT-551 and its metabolite TEMPOL-H against light-induced damage in rats. Exp Eye Res. 2010 Jul;91(1):111-4. doi: 10.1016/j.exer.2010.04.012. PubMed PMID: 20434439; PubMed Central PMCID: PMC3175818.

3: Zarling JA, Brunt VE, Vallerga AK, Li W, Tao A, Zarling DA, Minson CT. Nitroxide pharmaceutical development for age-related degeneration and disease. Front Genet. 2015 Nov 6;6:325. doi: 10.3389/fgene.2015.00325. Review. PubMed PMID: 26594225; PubMed Central PMCID: PMC4635221.

4: Tanito M, Li F, Elliott MH, Dittmar M, Anderson RE. Protective effect of TEMPOL derivatives against light-induced retinal damage in rats. Invest Ophthalmol Vis Sci. 2007 Apr;48(4):1900-5. PubMed PMID: 17389526.

5: Leung E, Landa G. Update on current and future novel therapies for dry age-related macular degeneration. Expert Rev Clin Pharmacol. 2013 Sep;6(5):565-79. doi: 10.1586/17512433.2013.829645. Review. PubMed PMID: 23971874.

6: Ni Z, Hui P. Emerging pharmacologic therapies for wet age-related macular degeneration. Ophthalmologica. 2009;223(6):401-10. doi: 10.1159/000228926. Review. PubMed PMID: 19622904.